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Reagents and conditions: (a) triphosgene, tert-butyl 4-amino-piperidine-1-carboxylate, Et3N, DCM, −78 °C to rt, overnight; (b) 4 N HCl in MeOH, rt, overnight; (c) 7, Jones reagent, acetone, 0 °C to rt, 2.4 h; (d) EDCI, Et3N, DCM, rt, overnight.
